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Redox Reactions question

2023 · 8 Apr · Shift 2 · Q6
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  5. /2023 · 8 Apr · Shift 2 · Q6

Redox Reactions question

2023 · 8 Apr · Shift 2 · Q6

JEE MainChemistryRedox ReactionsMCQ+4 / −1
Given below are two statements: Statement I : In redox titration, the indicators used are sensitive to change in pH\mathrm{pH}pH of the solution. Statement II : In acid-base titration, the indicators used are sensitive to change in oxidation potential. In the light of the above statements, choose the most appropriate answer from the options given below
  1. A
    Both Statement I and Statement II are incorrect
  2. B
    Statement I is correct but Statement II is incorrect
  3. C
    Statement I is incorrect but Statement II is correct
  4. D
    Both Statement I and Statement II are correct
View written solutionFree

Correct answer: A

  1. Understand Statement I

    Statement I says: In redox titration, the indicators used are sensitive to change in pH\mathrm{pH}pH of the solution.

    • In redox titrations, indicators are generally redox indicators.
    • These indicators respond to a change in oxidation-reduction potential (electrode potential), not primarily to pH\mathrm{pH}pH.
    • Example: diphenylamine, ferroin, etc. change color due to change in oxidation state.

    Therefore, Statement I is incorrect.

  2. Understand Statement II

    Statement II says: In acid-base titration, the indicators used are sensitive to change in oxidation potential.

    • In acid-base titrations, indicators are acid-base indicators like phenolphthalein, methyl orange, etc.
    • These indicators change color with change in pH\mathrm{pH}pH, not oxidation potential.

    Therefore, Statement II is incorrect.

  3. Evaluate the options

    • A: Both Statement I and Statement II are incorrect ✅
    • B: Statement I is correct but Statement II is incorrect ❌
    • C: Statement I is incorrect but Statement II is correct ❌
    • D: Both Statement I and Statement II are correct ❌

  4. Final conclusion

    Both statements are false.

    Hence, the correct option is A.

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